have a weakness for (someone or something)

have a weakness for (someone or something)

To have a special affinity for someone or something; to find someone or something irresistible. I have a weakness for candy bars, so Halloween is my favorite holiday. Jon has a weakness for redheads, so of course he's dating another ginger. Stu has a weakness for Patty, so I'm sure he'll clear his schedule once he hears she's in town.
See also: have, weakness
Farlex Dictionary of Idioms.

have a weakness for someone or something

Fig. to be unable to resist someone or something; to be (figuratively) powerless against someone or something. I have a weakness for chocolate. John has a weakness for Mary. I think he's in love.
See also: have, weakness
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

have a weakness for

Be susceptible to; also, like or enjoy. For example, She has a weakness for older men, or Bill has a weakness for fine wine. [c. 1700]
See also: have, weakness
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • be/have done with somebody/something
  • bird has flown, the
  • be in line with (someone or something)
  • better of
  • (someone or something) promises well
  • begin with
  • begin with (someone or something)
  • beware of
  • beware of (someone or something)
  • be rough on (someone or something)